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    Subject[PATCH 7/7] [RFC] APM emulation driver for class batteries
    It finds battery with "main_battery" flag set (or with max_capacity if no
    batteries marked as main), and converts battery values to APM form.

    ---
    drivers/battery/Kconfig | 7 +++
    drivers/battery/Makefile | 1 +
    drivers/battery/apm_power.c | 121 +++++++++++++++++++++++++++++++++++++++++++
    3 files changed, 129 insertions(+), 0 deletions(-)
    create mode 100644 drivers/battery/apm_power.c

    diff --git a/drivers/battery/Kconfig b/drivers/battery/Kconfig
    index 0c14ae0..bbf8283 100644
    --- a/drivers/battery/Kconfig
    +++ b/drivers/battery/Kconfig
    @@ -15,4 +15,11 @@ config BATTERY_DS2760
    help
    Say Y here to enable support for batteries with ds2760 chip.

    +config APM_POWER
    + tristate "APM emulation"
    + depends on BATTERY && APM
    + help
    + Say Y here to enable support APM status emulation using
    + battery class devices.
    +
    endmenu
    diff --git a/drivers/battery/Makefile b/drivers/battery/Makefile
    index 9902513..cea5807 100644
    --- a/drivers/battery/Makefile
    +++ b/drivers/battery/Makefile
    @@ -1,2 +1,3 @@
    obj-$(CONFIG_BATTERY) += battery.o
    obj-$(CONFIG_BATTERY_DS2760) += ds2760_battery.o
    +obj-$(CONFIG_APM_POWER) += apm_power.o
    diff --git a/drivers/battery/apm_power.c b/drivers/battery/apm_power.c
    new file mode 100644
    index 0000000..5e741c1
    --- /dev/null
    +++ b/drivers/battery/apm_power.c
    @@ -0,0 +1,121 @@
    +/*
    + * Copyright (c) 2007 Eugeny Boger
    + *
    + * Use consistent with the GNU GPL is permitted,
    + * provided that this copyright notice is
    + * preserved in its entirety in all copies and derived works.
    + */
    +
    +#include <linux/module.h>
    +#include <linux/battery.h>
    +#include <linux/apm-emulation.h>
    +#include <linux/list.h>
    +
    +#define BATTERY_PROPERTY(property) (main_battery->get_##property ? \
    + main_battery->get_##property(main_battery) : 0)
    +
    +static struct battery *main_battery;
    +
    +static void (*old_apm_get_power_status)(struct apm_power_info*);
    +
    +static void apm_battery_find_main_battery(void)
    +{
    + struct device *dev;
    + struct battery *bat, *batm;
    + int max_capacity = 0;
    +
    + main_battery = NULL;
    + batm = NULL;
    + list_for_each_entry(dev, &battery_class->devices, node) {
    + bat = dev_get_drvdata(dev);
    + /* If none of battery devices cantains 'main_battery' flag,
    + choice one with max capacity */
    + if (bat->get_max_capacity)
    + if (bat->get_max_capacity(bat) > max_capacity) {
    + batm = bat;
    + max_capacity = bat->get_max_capacity(bat);
    + }
    +
    + if (bat->main_battery)
    + main_battery = bat;
    + }
    + if (!main_battery)
    + main_battery = batm;
    +}
    +
    +static void apm_battery_apm_get_power_status(struct apm_power_info *info)
    +{
    + int bat_current;
    +
    + down(&battery_class->sem);
    + apm_battery_find_main_battery();
    + if (!main_battery) {
    + up(&battery_class->sem);
    + return;
    + }
    +
    + if (BATTERY_PROPERTY(status) == BATTERY_STATUS_FULL)
    + info->battery_life = 100;
    + else
    + if (BATTERY_PROPERTY(max_capacity) -
    + BATTERY_PROPERTY(min_capacity))
    + info->battery_life = ((BATTERY_PROPERTY(capacity) -
    + BATTERY_PROPERTY(min_capacity)) * 100) /
    + (BATTERY_PROPERTY(max_capacity) -
    + BATTERY_PROPERTY(min_capacity));
    + else
    + info->battery_life = -1;
    + if ((BATTERY_PROPERTY(status) == BATTERY_STATUS_CHARGING)
    + || (BATTERY_PROPERTY(status) == BATTERY_STATUS_NOT_CHARGING)
    + || (BATTERY_PROPERTY(status) == BATTERY_STATUS_FULL))
    + info->ac_line_status = APM_AC_ONLINE;
    + else
    + info->ac_line_status = APM_AC_OFFLINE;
    +
    + if (BATTERY_PROPERTY(status) == BATTERY_STATUS_CHARGING)
    + info->battery_status = APM_BATTERY_STATUS_CHARGING;
    + else {
    + if (info->battery_life > 50)
    + info->battery_status = APM_BATTERY_STATUS_HIGH;
    + else if (info->battery_life > 5)
    + info->battery_status = APM_BATTERY_STATUS_LOW;
    + else
    + info->battery_status = APM_BATTERY_STATUS_CRITICAL;
    + }
    + info->battery_flag = info->battery_status;
    +
    + bat_current = BATTERY_PROPERTY(current);
    + if (bat_current)
    + info->time = ((BATTERY_PROPERTY(capacity) -
    + BATTERY_PROPERTY(min_capacity)) * 60) /
    + bat_current;
    + else
    + info->time = -1;
    +
    + info->units = APM_UNITS_MINS;
    +
    + up(&battery_class->sem);
    + return;
    +}
    +
    +static int __init apm_battery_init(void)
    +{
    + printk(KERN_INFO "APM Battery Driver\n");
    +
    + old_apm_get_power_status = apm_get_power_status;
    + apm_get_power_status = apm_battery_apm_get_power_status;
    + return 0;
    +}
    +
    +static void __exit apm_battery_exit(void)
    +{
    + apm_get_power_status = old_apm_get_power_status;
    + return;
    +}
    +
    +module_init(apm_battery_init);
    +module_exit(apm_battery_exit);
    +
    +MODULE_AUTHOR("Eugeny Boger");
    +MODULE_DESCRIPTION("APM emulation driver for battery monitoring class");
    +MODULE_LICENSE("GPL");
    --
    1.5.0.5-dirty
    -
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